Sudoku is a puzzle video game developed by Sumo Digital and published by Sony Computer Entertainment for the PlayStation Portable.

It was released in Japan under the name of Kazuo (カズオ), as Nikoli holds the trademark for Sudoku in the region, The base game features 1000 Sudoku puzzles grouped by difficulty, as well as various modes, customizable grids and multiplayer.

Sudoku official website, and players can add their own custom backgrounds to the games.

There is a major glitch in the PSP version, in which a mysterious message dialog pops up at semi-regular intervals throughout the game if the console is not plugged in or fully charged.

[2] The dialog box covers the entire playing board, interrupting gameplay.